BMX Grips - How much would you spend?

I have the opportunity to buy some old school bmx grips that have been lightly used (they look a little dirty, but not too worn) ...How much would you guys spend on these? I still don't have any grips for my case and I really want some but I don't really know what they're actually worth, thoughts?

I have the opportunity to buy some old school bmx grips that have been lightly used (they look a little dirty, but not too worn) ...How much would you guys spend on these? I still don't have any grips for my case and I really want some but I don't really know what they're actually worth, thoughts?